[dx101] extensions fixes

[Raphael]

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Hi all,

Changelog:
  - more Extensions work (begin to detect ATI extensions)
  - try to fix D3DTADDRESS_BORDER, D3DTADDRESS_MIRROR, D3DTADDRESS_MIRRORONCE 
using OpenGL extensions
  - better set_tex_op: now use Runtime Extension support (and not compile 
support)

Best Regards,
Raphael
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